Monday, August 20, 2018, 17:58

14.9 g of np-SiC fibrous target discs are loaded into the container (previously coated with TaC and sintered, see elog ID 414).

Total loaded length 9.5 cm. 

A 1.5" width graphite sheet is used as under layer to prevent TaC diffused to the discs; this was observed during the heat treatment, (see dropbox SEM images).

Both end caps are in.  With ionizer pointing out, right cap is expended BUT NOT left cap - will need to expend this after the conditioning.

No Ta heat-shield is used.

Final conditioning temperature:  1500 C (As per e-log 414, TGHT = 450A/7.31V, 3.28kW) 

Keeping TBHT at 0A for now - will ramp up after TGHT reach to the desired temperature. 

OMEGA slope set at 0.99

Good vac = 3.0e-5 Torr,

Bad vac = 5.0e-5 Torr.

 Tuesday, August 21, 2018, 10:24

Pressure at 1.2e-6 Torr. 

Initiated autoramping at 2A/min for TGHT to reach 400A - monitoring temp and vacuum.

TBHT set at 10A. 

 Tuesday, August 21, 2018, 15:13

Temp reached to 1350C. TGHT at 400A/6.7V. Pressure at 1.9e-6 Torr after holding at the temp for 100 min.

 Tuesday, August 21, 2018, 15:28

Tapped up TGHT to 450A/7.8V (3.5kW).  Temp measured at 1465 +/- 5 C.  Pressure coming down from 3.5 e-6 Torr.

 Tuesday, August 21, 2018, 15:32

Tapping up TBHT to 230A

 Tuesday, August 21, 2018, 16:25

TBHT at 230A/4.33V.  Pressure started to increase from 150A, and reached to 3.3e-6 Torr after TGHT reached to the setting.

Temperature measured at 1475 C +/- 5C.  Holding at this temperature until vacuum comes to stabilization (est.2-3 hours)

 Tuesday, August 21, 2018, 16:45

Checked with Mikron (slope set at 0.99); temp on left end-cap measured at 1490 +/- 20C (that's close enough).  Temp on ionizer tube about 1900C

 Tuesday, August 21, 2018, 22:12

Pressure at 1.7e-6 Torr.  Temp holding at 1480C, TGHT at 450/7.7V, TBHT 230A/4.27V.

Cooling down at 2A/min for TGHT and 1A/min for TBHT